题目内容
| 解方程或比例. ①2.5+x=30 | ②x-
| ③
|
(1)2.5+x=30,
2.5+x-2.5=30-2.5,
x=27.5;
(2)x-
x=
,
x=
,
x÷
=
÷
,
x=
;
(3 )
=
,
0.4x=28×0.1,
0.4x÷0.4=2.8÷0.4,
x=7.
2.5+x-2.5=30-2.5,
x=27.5;
(2)x-
| 4 |
| 9 |
| 10 |
| 21 |
| 5 |
| 9 |
| 10 |
| 21 |
| 5 |
| 9 |
| 5 |
| 9 |
| 10 |
| 21 |
| 5 |
| 9 |
x=
| 6 |
| 7 |
(3 )
| 28 |
| x |
| 0.4 |
| 0.1 |
0.4x=28×0.1,
0.4x÷0.4=2.8÷0.4,
x=7.
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